Browse > Article
http://dx.doi.org/10.9711/KTAJ.2013.15.3.333

Groundwater inflow rate estimation considering excavation-induced permeability reduction in the vicinity of a tunnel  

Moon, Joon-Shik (Dept. of Civil Engineering, Kyungpook National University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.15, no.3, 2013 , pp. 333-344 More about this Journal
Abstract
This paper discussed about the effect of permeability reduction of the jointed rock mass in the vicinity of a tunnel which is one of the reasons making large difference between the estimated ground-water inflow rate and the measured value. Current practice assumes that the jointed rock mass around a tunnel is a homogeneous, isotropic porous medium with constant permeability. However, in actual condition the permeability of a jointed rock mass varies with the change of effective stress condition around a tunnel, and in turn effective stress condition is affected by the ground water flow in the jointed rock mass around the tunnel. In short time after tunnel excavation, large increase of effective tangential stress around a tunnel due to stress concentration and pore-water pressure drop, and consequently large joint closure followed by significant permeability reduction of jointed rock mass in the vicinity of a tunnel takes place. A significant pore-water pressure drop takes place across this ring zone in the vicinity of a tunnel, and the actual pore-water pressure distribution around a tunnel shows large difference from the value estimated by an analytical solution assuming the jointed rock mass around the tunnel as a homogeneous, isotropic medium. This paper presents the analytical solution estimating pore-water pressure distribution and ground-water inflow rate into a tunnel based on the concept of hydro-mechanically coupled behavior of a jointed rock mass and the solution is verified by numerical analysis.
Keywords
Permeability of jointed rock mass; Hydro-mechanically coupled behavior; Ground-water inflow rate into a tunnel; Pore-water pressure distribution around a tunnel;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Alvarez, T.A, Cording, E.J., Mikhail, R. (1995), "Hydromechnical behavior of rock joints, A re-interpretation of published experiments", Proc. 35th U.S. Symposium on Rock Mechanics, Daemen & Schultz, Eds., pp. 665-671.
2 Bandis, S.C., Lumsden, A.C., Barton, N. (1983), "Fundamentals of rock joint deformation", Int. J. Rock Mech. Min. Sci. & Geomech. Abstr., Vol. 20, No. 6, pp. 249-268.   DOI   ScienceOn
3 Barton, N., Bandis, S. (1982), "Effects of block size on the shear behavior of jointed rock", 23rd U.S. Symp. on Rock Mechanics, Keynote Lecture, Univ. of California, Berkeley.
4 Buehler, Ch., Heitz, D., Trick, Th., Frieg, B. (2003), "In situ Self-Sealing of the EDZ as a consequence of loading, impact of the excavation disturbed or damaged zone (EDZ) onthe performance of radioactive waste geological repositories", A European Commission CLUSTER Conference and Workshop, Luxembourg, 3 to 5 November 2003.
5 Fernandez, G., Alvarez, T.A. (1994), "Seepageinduced effective stresses and water pressures around pressure tunnels", Journal of Geotechnical Engineering, Vol. 120, No. 1, pp. 108-128.   DOI   ScienceOn
6 Gale, J.E., Raven, K.G. (1980), "Effect of sample size on stress-permeability relationship for national fractures", Technical Information Report No. 48, LBL-11865, SAC-48, UC-70.
7 Goodman, R.E. (1974), "The mechanical properties of joints", Proc. 3rd Congr. ISRM, Denver, Vol. 1A, pp. 127-140.
8 Goodman, R.E., Moye, D.G., Van Schalkwyk, A., and Javandel, I. (1965), "Groundwater inflows during tunnel driving", Eng. Geol., Vol. 2, No. 1, pp. 39-56.
9 Harr, M.E. (1962), Groundwater and Seepage, Chap. 10, pp. 249-264.
10 Heuer, R.E. (1995), "Estimating rock tunnel water inflow", Rapid Excavation and Tunneling Conference, Chap. 3, pp. 41-60.
11 Heuer, R.E. (2005), "Estimating rock tunnel water inflow", Rapid Excavation and Tunneling Conference, Chap. 3, pp. 41-60.
12 Iwai, K. (1976), Fundamental Studies of Fluid Flow Through a Sigle Fracture, Ph.D. Thesis, Univ. of California, Berkeley, p. 208.
13 Pusch, R., Borgesson, L., Ramqvist, G. (2003a), "Hydraulic characterization of EDZ in a blasted tunnel in crystalline rock-Measurements and excavation, impact of the excavation disturbed or damaged zone (EDZ) on the performance of radioactive waste geological repositories", A European Commission CLUSTER Conference and Workshop, Luxembourg.
14 Pusch, R., Liedtke, L. (2003b), "EDZ formation in crystalline rock by TBM drilling and related alteration of hydraulic conductivity, impact of the excavation disturbed or damaged zone (EDZ) on the performance of radioactive waste geological repositories", A European Commission CLUSTER Conference and Workshop, Luxembourg.
15 Snow, D.T. (1972), "Fundamentals and in-situ determination of hydraulic conductivity", Proc. Symp. On Percolation Through Fissured Rock.
16 Zhang, L., Franklin, J.A. (1993) "Prediction of water flow into rock tunnels: an analytical solution assuming an hydraulic conductivity gradient", International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstract, Vo. 30, No. 1, pp. 37-46.   DOI   ScienceOn